200000121211021 has 4 divisors (see below), whose sum is σ = 211764834223452. Its totient is φ = 188235408198592.

The previous prime is 200000121210979. The next prime is 200000121211031. The reversal of 200000121211021 is 120112121000002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95957795598025 + 104042325612996 = 9795805^2 + 10200114^2 .

It is a cyclic number.

It is not a de Polignac number, because 200000121211021 - 2³¹ = 199997973727373 is a prime.

It is a super-2 number, since 2×200000121211021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200000121210992 and 200000121211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200000121211031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5882356506190 + ... + 5882356506223.

It is an arithmetic number, because the mean of its divisors is an integer number (52941208555863).

Almost surely, 2^{200000121211021} is an apocalyptic number.

It is an amenable number.

200000121211021 is a deficient number, since it is larger than the sum of its proper divisors (11764713012431).

200000121211021 is a wasteful number, since it uses less digits than its factorization.

200000121211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11764713012430.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 200000121211021 its reverse (120112121000002), we get a palindrome (320112242211023).

The spelling of 200000121211021 in words is "two hundred trillion, one hundred twenty-one million, two hundred eleven thousand, twenty-one".